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Block Expressions and give

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This commit is contained in:
Ginger Bill
2016-12-30 15:45:10 +00:00
parent d714bece47
commit 23d32f34e5
12 changed files with 605 additions and 106 deletions
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src/checker/stmt.c
+10 -14
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@@ -1,16 +1,3 @@
bool check_is_terminating(AstNode *node);
bool check_has_break (AstNode *stmt, bool implicit);
void check_stmt (Checker *c, AstNode *node, u32 flags);
// Statements and Declarations
typedef enum StmtFlag {
Stmt_BreakAllowed = GB_BIT(0),
Stmt_ContinueAllowed = GB_BIT(1),
Stmt_FallthroughAllowed = GB_BIT(2), // TODO(bill): fallthrough
} StmtFlag;
void check_stmt_list(Checker *c, AstNodeArray stmts, u32 flags) {
if (stmts.count == 0) {
return;
@@ -40,6 +27,10 @@ void check_stmt_list(Checker *c, AstNodeArray stmts, u32 flags) {
if (n->kind == AstNode_ReturnStmt && i+1 < max) {
error_node(n, "Statements after this `return` are never executed");
} else if (n->kind == AstNode_ExprStmt && i+1 < max) {
if (n->ExprStmt.expr->kind == AstNode_GiveExpr) {
error_node(n, "A `give` must be the last statement in a block");
}
}
check_stmt(c, n, new_flags);
@@ -48,7 +39,6 @@ void check_stmt_list(Checker *c, AstNodeArray stmts, u32 flags) {
}
bool check_is_terminating_list(AstNodeArray stmts) {
// Iterate backwards
for (isize n = stmts.count-1; n >= 0; n--) {
AstNode *stmt = stmts.e[n];
@@ -355,6 +345,12 @@ void check_stmt_internal(Checker *c, AstNode *node, u32 flags) {
if (operand.expr->kind == AstNode_CallExpr) {
return;
}
if (operand.expr->kind == AstNode_GiveExpr) {
if ((flags&Stmt_GiveAllowed) != 0) {
return;
}
error_node(node, "Illegal use of `give`");
}
gbString expr_str = expr_to_string(operand.expr);
error_node(node, "Expression is not used: `%s`", expr_str);
gb_string_free(expr_str);